From e7ee4873d5b7320dd581477fa2bd7b2dc7a52030 Mon Sep 17 00:00:00 2001 From: Stefan Csomor Date: Sun, 13 Sep 2009 17:17:40 +0000 Subject: [PATCH] adding emulation API for OpenGL ES platforms git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61906 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775 --- include/wx/glcanvas.h | 25 +++++ src/common/glcmn.cpp | 218 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 243 insertions(+) diff --git a/include/wx/glcanvas.h b/include/wx/glcanvas.h index 9bd0035457..3af85386d0 100644 --- a/include/wx/glcanvas.h +++ b/include/wx/glcanvas.h @@ -215,6 +215,31 @@ private: #endif // !wxGL_APP_DEFINED +// ---------------------------------------------------------------------------- +// wxGLAPI: an API wrapper that allows the use of 'old' APIs even on OpenGL +// platforms that don't support it natively anymore, if the APIs are available +// it's a mere redirect +// ---------------------------------------------------------------------------- + +#ifndef wxUSE_OPENGL_EMULATION + #define wxUSE_OPENGL_EMULATION 0 +#endif + +class WXDLLIMPEXP_GL wxGLAPI : public wxObject +{ +public: + wxGLAPI(); + ~wxGLAPI(); + + static void glBegin(GLenum mode); + static void glTexCoord2f(GLfloat s, GLfloat t); + static void glVertex3f(GLfloat x, GLfloat y, GLfloat z); + static void glNormal3f(GLfloat nx, GLfloat ny, GLfloat nz); + static void glColor4f(GLfloat r, GLfloat g, GLfloat b, GLfloat a); + static void glColor3f(GLfloat r, GLfloat g, GLfloat b); + static void glEnd(); +}; + #endif // wxUSE_GLCANVAS #endif // _WX_GLCANVAS_H_BASE_ diff --git a/src/common/glcmn.cpp b/src/common/glcmn.cpp index 675f512a4d..e52e4173e8 100644 --- a/src/common/glcmn.cpp +++ b/src/common/glcmn.cpp @@ -59,6 +59,7 @@ bool wxGLCanvasBase::SetCurrent(const wxGLContext& context) const // that SetCurrent() can only be called for a shown window, so check for it wxASSERT_MSG( IsShownOnScreen(), wxT("can't make hidden GL canvas current") ); + return context.SetCurrent(*static_cast(this)); } @@ -144,5 +145,222 @@ bool wxGLCanvasBase::IsExtensionInList(const char *list, const char *extension) return false; } +// ============================================================================ +// compatibility layer for OpenGL 3 and OpenGL ES +// ============================================================================ + +static wxGLAPI s_glAPI; + +#if wxUSE_OPENGL_EMULATION + +#include "wx/vector.h" + +static GLenum s_mode; + +static GLfloat s_currentTexCoord[2]; +static GLfloat s_currentColor[4]; +static GLfloat s_currentNormal[3]; + +// TODO move this into a different construct with locality for all attributes +// of a vertex + +static wxVector s_texCoords; +static wxVector s_vertices; +static wxVector s_normals; +static wxVector s_colors; + +static bool s_texCoordsUsed; +static bool s_colorsUsed; +static bool s_normalsUsed; + +bool SetState( int flag, bool desired ) +{ + bool former = glIsEnabled( flag ); + if ( former != desired ) + { + if ( desired ) + glEnableClientState(flag); + else + glDisableClientState(flag); + } + return former; +} + +void RestoreState( int flag, bool desired ) +{ + if ( desired ) + glEnableClientState(flag); + else + glDisableClientState(flag); +} +#endif + +wxGLAPI::wxGLAPI() +{ +#if wxUSE_OPENGL_EMULATION + s_mode = 0xFF; +#endif +} + +wxGLAPI::~wxGLAPI() +{ +} + +void wxGLAPI::glBegin(GLenum mode) +{ +#if wxUSE_OPENGL_EMULATION + if ( s_mode != 0xFF ) + { + wxFAIL_MSG("nested glBegin"); + } + + s_mode = mode; + s_texCoordsUsed = false; + s_colorsUsed = false; + s_normalsUsed = false; + + s_texCoords.clear(); + s_normals.clear(); + s_colors.clear(); + s_vertices.clear(); +#else + ::glBegin(mode); +#endif +} + +void wxGLAPI::glTexCoord2f(GLfloat s, GLfloat t) +{ +#if wxUSE_OPENGL_EMULATION + if ( s_mode == 0xFF ) + { + wxFAIL_MSG("glTexCoord2f called outside glBegin/glEnd"); + } + + else + { + s_texCoordsUsed = true; + s_currentTexCoord[0] = s; + s_currentTexCoord[1] = t; + } +#else + ::glTexCoord2f(s,t); +#endif +} + +void wxGLAPI::glVertex3f(GLfloat x, GLfloat y, GLfloat z) +{ +#if wxUSE_OPENGL_EMULATION + if ( s_mode == 0xFF ) + { + wxFAIL_MSG("glVertex3f called outside glBegin/glEnd"); + } + else + { + s_texCoords.push_back(s_currentTexCoord[0]); + s_texCoords.push_back(s_currentTexCoord[1]); + + s_normals.push_back(s_currentNormal[0]); + s_normals.push_back(s_currentNormal[1]); + s_normals.push_back(s_currentNormal[2]); + + s_colors.push_back(s_currentColor[0]); + s_colors.push_back(s_currentColor[1]); + s_colors.push_back(s_currentColor[2]); + s_colors.push_back(s_currentColor[3]); + + s_vertices.push_back(x); + s_vertices.push_back(y); + s_vertices.push_back(z); + } +#else + ::glVertex3f(x,y,z); +#endif +} + +void wxGLAPI::glNormal3f(GLfloat nx, GLfloat ny, GLfloat nz) +{ +#if wxUSE_OPENGL_EMULATION + if ( s_mode == 0xFF ) + ::glNormal3f(nx,ny,nz); + else + { + s_normalsUsed = true; + s_currentNormal[0] = nx; + s_currentNormal[1] = ny; + s_currentNormal[2] = nz; + } +#else + ::glNormal3f(nx,ny,nz); +#endif +} + +void wxGLAPI::glColor4f(GLfloat r, GLfloat g, GLfloat b, GLfloat a) +{ +#if wxUSE_OPENGL_EMULATION + if ( s_mode == 0xFF ) + ::glColor4f(r,g,b,a); + else + { + s_colorsUsed = true; + s_currentColor[0] = r; + s_currentColor[1] = g; + s_currentColor[2] = b; + s_currentColor[3] = a; + } +#else + ::glColor4f(r,g,b,a); +#endif +} + +void wxGLAPI::glColor3f(GLfloat r, GLfloat g, GLfloat b) +{ +#if wxUSE_OPENGL_EMULATION + glColor4f(r,g,b,1.0); +#else + ::glColor3f(r,g,b); +#endif +} + +void wxGLAPI::glEnd() +{ +#if wxUSE_OPENGL_EMULATION + bool formerColors = SetState( GL_COLOR_ARRAY, s_colorsUsed ); + bool formerNormals = SetState( GL_NORMAL_ARRAY, s_normalsUsed ); + bool formerTexCoords = SetState( GL_TEXTURE_COORD_ARRAY, s_texCoordsUsed ); + bool formerVertex = glIsEnabled(GL_VERTEX_ARRAY); + + if( !formerVertex ) + glEnableClientState(GL_VERTEX_ARRAY); + + if ( s_colorsUsed ) + glColorPointer( 4, GL_FLOAT, 0, &s_colors[0] ); + + if ( s_normalsUsed ) + glNormalPointer( GL_FLOAT, 0, &s_normals[0] ); + + if ( s_texCoordsUsed ) + glTexCoordPointer( 2, GL_FLOAT, 0, &s_texCoords[0] ); + + glVertexPointer(3, GL_FLOAT, 0, &s_vertices[0]); + glDrawArrays( s_mode, 0, s_vertices.size() / 3 ); + + if ( s_colorsUsed != formerColors ) + RestoreState( GL_COLOR_ARRAY, formerColors ); + + if ( s_normalsUsed != formerNormals ) + RestoreState( GL_NORMAL_ARRAY, formerColors ); + + if ( s_texCoordsUsed != formerTexCoords ) + RestoreState( GL_TEXTURE_COORD_ARRAY, formerColors ); + + if( !formerVertex ) + glDisableClientState(GL_VERTEX_ARRAY); + + s_mode = 0xFF; +#else + ::glEnd(); +#endif +} + #endif // wxUSE_GLCANVAS -- 2.45.2