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//
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// Book: OpenGL(R) ES 2.0 Programming Guide
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// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
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// ISBN-10: 0321502795
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// ISBN-13: 9780321502797
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// Publisher: Addison-Wesley Professional
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// URLs: http://safari.informit.com/9780321563835
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// http://www.opengles-book.com
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//
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//
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/// \file ESUtil.h
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/// \brief A utility library for OpenGL ES. This library provides a
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/// basic common framework for the example applications in the
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/// OpenGL ES 2.0 Programming Guide.
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//
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#ifndef ESUTIL_H
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#define ESUTIL_H
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///
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// Includes
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//
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#if __APPLE__
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#include <OpenGLES/ES3/gl.h>
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#include <OpenGLES/ES3/glext.h>
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#include <OPenGLES/EAGL.h>
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#include <OPenGLES/EAGLDrawable.h>
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#else
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#include <GLES3/gl3.h>
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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///
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// Macros
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//
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#define ESUTIL_API __cdecl
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#define ESCALLBACK __cdecl
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/// esCreateWindow flag - RGB color buffer
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#define ES_WINDOW_RGB 0
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/// esCreateWindow flag - ALPHA color buffer
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#define ES_WINDOW_ALPHA 1
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/// esCreateWindow flag - depth buffer
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#define ES_WINDOW_DEPTH 2
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/// esCreateWindow flag - stencil buffer
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#define ES_WINDOW_STENCIL 4
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/// esCreateWindow flag - multi-sample buffer
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#define ES_WINDOW_MULTISAMPLE 8
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/// esCreateWindow flag - EGL_POST_SUB_BUFFER_NV supported.
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#define ES_WINDOW_POST_SUB_BUFFER_SUPPORTED 16
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///
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// Types
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//
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typedef struct
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{
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GLfloat m[4][4];
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} ESMatrix;
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typedef struct
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{
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/// Put your user data here...
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void* userData;
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/// Window width
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GLint width;
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/// Window height
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GLint height;
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/// Window handle
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EGLNativeWindowType hWnd;
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/// EGL display
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EGLDisplay eglDisplay;
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/// EGL context
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EGLContext eglContext;
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/// EGL surface
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EGLSurface eglSurface;
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/// Callbacks
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void (ESCALLBACK *drawFunc) ( void* );
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void (ESCALLBACK *keyFunc) ( void*, unsigned char, int, int );
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void (ESCALLBACK *updateFunc) ( void*, float deltaTime );
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} ESContext;
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///
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// Extensions
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//
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extern PFNEGLCREATEIMAGEKHRPROC eglCreateImageKHR;
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extern PFNEGLDESTROYIMAGEKHRPROC eglDestroyImageKHR;
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extern PFNEGLPOSTSUBBUFFERNVPROC eglPostSubBufferNV;
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/*extern PFNGLEGLIMAGETARGETTEXTURE2DOESPROC glEGLImageTargetTexture2DOES;
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extern PFNGLDELETEFENCESNVPROC glDeleteFencesNV;
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extern PFNGLGENFENCESNVPROC glGenFencesNV;
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extern PFNGLGETFENCEIVNVPROC glGetFenceivNV;
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extern PFNGLISFENCENVPROC glIsFenceNV;
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extern PFNGLFINISHFENCENVPROC glFinishFenceNV;
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extern PFNGLSETFENCENVPROC glSetFenceNV;
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extern PFNGLTESTFENCENVPROC glTestFenceNV;
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*/
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///
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// Public Functions
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//
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//
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///
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/// \brief Initialize ES framework context. This must be called before calling any other functions.
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/// \param esContext Application context
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//
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void ESUTIL_API esInitContext ( ESContext *esContext );
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//
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/// \brief Create a window with the specified parameters
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/// \param esContext Application context
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/// \param title Name for title bar of window
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/// \param width Width in pixels of window to create
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/// \param height Height in pixels of window to create
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/// \param flags Bitfield for the window creation flags
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/// ES_WINDOW_RGB - specifies that the color buffer should have R,G,B channels
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/// ES_WINDOW_ALPHA - specifies that the color buffer should have alpha
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/// ES_WINDOW_DEPTH - specifies that a depth buffer should be created
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/// ES_WINDOW_STENCIL - specifies that a stencil buffer should be created
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/// ES_WINDOW_MULTISAMPLE - specifies that a multi-sample buffer should be created
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/// ES_WINDOW_POST_SUB_BUFFER_SUPPORTED - specifies that EGL_POST_SUB_BUFFER_NV is supported.
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/// \return GL_TRUE if window creation is succesful, GL_FALSE otherwise
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GLboolean ESUTIL_API esCreateWindow ( ESContext *esContext, LPCTSTR title, GLint width, GLint height, GLuint flags );
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GLboolean ESUTIL_API esCreateContext ( ESContext *esContext, GLuint flags );
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//
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/// \brief Register a draw callback function to be used to render each frame
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/// \param esContext Application context
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/// \param drawFunc Draw callback function that will be used to render the scene
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//
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void ESUTIL_API esRegisterDrawFunc ( ESContext *esContext, void (ESCALLBACK *drawFunc) ( ESContext* ) );
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//
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/// \brief Register an update callback function to be used to update on each time step
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/// \param esContext Application context
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/// \param updateFunc Update callback function that will be used to render the scene
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//
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void ESUTIL_API esRegisterUpdateFunc ( ESContext *esContext, void (ESCALLBACK *updateFunc) ( ESContext*, float ) );
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//
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/// \brief Register an keyboard input processing callback function
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/// \param esContext Application context
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/// \param keyFunc Key callback function for application processing of keyboard input
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//
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void ESUTIL_API esRegisterKeyFunc ( ESContext *esContext,
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void (ESCALLBACK *drawFunc) ( ESContext*, unsigned char, int, int ) );
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//
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/// \brief Log a message to the debug output for the platform
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/// \param formatStr Format string for error log.
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//
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void ESUTIL_API esLogMessage ( const char *formatStr, ... );
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//
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///
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/// \brief Load a shader, check for compile errors, print error messages to output log
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/// \param type Type of shader (GL_VERTEX_SHADER or GL_FRAGMENT_SHADER)
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/// \param shaderSrc Shader source string
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/// \return A new shader object on success, 0 on failure
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//
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GLuint ESUTIL_API esLoadShader ( GLenum type, const char *shaderSrc );
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//
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///
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/// \brief Load a vertex and fragment shader, create a program object, link program.
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/// Errors output to log.
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/// \param vertShaderSrc Vertex shader source code
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/// \param fragShaderSrc Fragment shader source code
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/// \return A new program object linked with the vertex/fragment shader pair, 0 on failure
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//
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GLuint ESUTIL_API esLoadProgram ( const char *vertShaderSrc, const char *fragShaderSrc );
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//
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/// \brief Generates geometry for a sphere. Allocates memory for the vertex data and stores
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/// the results in the arrays. Generate index list for a TRIANGLE_STRIP
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/// \param numSlices The number of slices in the sphere
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/// \param vertices If not NULL, will contain array of float3 positions
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/// \param normals If not NULL, will contain array of float3 normals
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/// \param texCoords If not NULL, will contain array of float2 texCoords
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/// \param indices If not NULL, will contain the array of indices for the triangle strip
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/// \return The number of indices required for rendering the buffers (the number of indices stored in the indices array
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/// if it is not NULL ) as a GL_TRIANGLE_STRIP
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//
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int ESUTIL_API esGenSphere ( int numSlices, float radius, GLfloat **vertices, GLfloat **normals,
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GLfloat **texCoords, GLushort **indices );
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//
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/// \brief Generates geometry for a cube. Allocates memory for the vertex data and stores
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/// the results in the arrays. Generate index list for a TRIANGLES
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/// \param scale The size of the cube, use 1.0 for a unit cube.
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/// \param vertices If not NULL, will contain array of float3 positions
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/// \param normals If not NULL, will contain array of float3 normals
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/// \param texCoords If not NULL, will contain array of float2 texCoords
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/// \param indices If not NULL, will contain the array of indices for the triangle strip
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/// \return The number of indices required for rendering the buffers (the number of indices stored in the indices array
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/// if it is not NULL ) as a GL_TRIANGLES
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//
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int ESUTIL_API esGenCube ( float scale, GLfloat **vertices, GLfloat **normals,
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GLfloat **texCoords, GLushort **indices );
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//
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/// \brief multiply matrix specified by result with a scaling matrix and return new matrix in result
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/// \param result Specifies the input matrix. Scaled matrix is returned in result.
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/// \param sx, sy, sz Scale factors along the x, y and z axes respectively
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//
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void ESUTIL_API esScale(ESMatrix *result, GLfloat sx, GLfloat sy, GLfloat sz);
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//
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/// \brief multiply matrix specified by result with a translation matrix and return new matrix in result
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/// \param result Specifies the input matrix. Translated matrix is returned in result.
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/// \param tx, ty, tz Scale factors along the x, y and z axes respectively
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//
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void ESUTIL_API esTranslate(ESMatrix *result, GLfloat tx, GLfloat ty, GLfloat tz);
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//
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/// \brief multiply matrix specified by result with a rotation matrix and return new matrix in result
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/// \param result Specifies the input matrix. Rotated matrix is returned in result.
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/// \param angle Specifies the angle of rotation, in degrees.
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/// \param x, y, z Specify the x, y and z coordinates of a vector, respectively
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//
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void ESUTIL_API esRotate(ESMatrix *result, GLfloat angle, GLfloat x, GLfloat y, GLfloat z);
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//
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// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result
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/// \param result Specifies the input matrix. new matrix is returned in result.
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/// \param left, right Coordinates for the left and right vertical clipping planes
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/// \param bottom, top Coordinates for the bottom and top horizontal clipping planes
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/// \param nearZ, farZ Distances to the near and far depth clipping planes. Both distances must be positive.
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//
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void ESUTIL_API esFrustum(ESMatrix *result, float left, float right, float bottom, float top, float nearZ, float farZ);
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//
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/// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result
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/// \param result Specifies the input matrix. new matrix is returned in result.
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/// \param fovy Field of view y angle in degrees
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/// \param aspect Aspect ratio of screen
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/// \param nearZ Near plane distance
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/// \param farZ Far plane distance
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//
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void ESUTIL_API esPerspective(ESMatrix *result, float fovy, float aspect, float nearZ, float farZ);
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//
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/// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result
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/// \param result Specifies the input matrix. new matrix is returned in result.
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/// \param left, right Coordinates for the left and right vertical clipping planes
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/// \param bottom, top Coordinates for the bottom and top horizontal clipping planes
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/// \param nearZ, farZ Distances to the near and far depth clipping planes. These values are negative if plane is behind the viewer
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//
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void ESUTIL_API esOrtho(ESMatrix *result, float left, float right, float bottom, float top, float nearZ, float farZ);
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//
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/// \brief perform the following operation - result matrix = srcA matrix * srcB matrix
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/// \param result Returns multiplied matrix
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/// \param srcA, srcB Input matrices to be multiplied
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//
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void ESUTIL_API esMatrixMultiply(ESMatrix *result, ESMatrix *srcA, ESMatrix *srcB);
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//
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//// \brief return an indentity matrix
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//// \param result returns identity matrix
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//
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void ESUTIL_API esMatrixLoadIdentity(ESMatrix *result);
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#ifdef __cplusplus
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}
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#endif
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#endif // ESUTIL_H
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