/**
* Returns JNI_TRUE only if all of the following conditions are met:
* - the GL_ARB_fragment_shader extension is available
* - the Linear/RadialGradientPaint shader codepath has been enabled via the
* system property
*/
static jboolean
OGLContext_IsGradShaderSupportAvailable(JNIEnv *env,
jboolean fragShaderAvailable)
{
jboolean isGradShaderEnabled = JNI_FALSE;
J2dTraceLn(J2D_TRACE_INFO, "OGLContext_IsGradShaderSupportAvailable");
// first see if the fragment shader extension is available
if (!fragShaderAvailable) {
return JNI_FALSE;
}
// next see if the gradshader system property has been enabled
isGradShaderEnabled =
JNU_GetStaticFieldByName(env, NULL,
"sun/java2d/opengl/OGLSurfaceData",
"isGradShaderEnabled", "Z").z;
if (!isGradShaderEnabled) {
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsGradShaderSupportAvailable: disabled via flag");
return JNI_FALSE;
}
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsGradShaderSupportAvailable: Linear/RadialGradientPaint shader supported");
return JNI_TRUE;
}
static jobject find_origin_constant(JNIEnv* env, const char* enum_name) {
jvalue field;
field = JNU_GetStaticFieldByName(env,
NULL,
"com/sun/management/VMOption$Origin",
enum_name,
"Lcom/sun/management/VMOption$Origin;");
return (*env)->NewGlobalRef(env, field.l);
}
/**
* Returns JNI_TRUE only if all of the following conditions are met:
* - the GL_ARB_fragment_shader extension is available
* - the BufferedImageOp shader codepath has been enabled via the
* system property
*/
static jboolean
OGLContext_IsBIOpShaderSupportAvailable(JNIEnv *env,
jboolean fragShaderAvailable)
{
jboolean isBIOpShaderEnabled = JNI_FALSE;
J2dTraceLn(J2D_TRACE_INFO, "OGLContext_IsBIOpShaderSupportAvailable");
// first see if the fragment shader extension is available
if (!fragShaderAvailable) {
return JNI_FALSE;
}
// next see if the biopshader system property has been enabled
isBIOpShaderEnabled =
JNU_GetStaticFieldByName(env, NULL,
"sun/java2d/opengl/OGLSurfaceData",
"isBIOpShaderEnabled", "Z").z;
if (!isBIOpShaderEnabled) {
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsBIOpShaderSupportAvailable: disabled via flag");
return JNI_FALSE;
}
/*
* Note: In theory we should probably do some other checks here, like
* linking a sample shader to see if the hardware truly supports our
* shader programs. However, our current BufferedImageOp shaders were
* designed to support first-generation shader-level hardware, so the
* assumption is that if our shaders work on those GPUs, then they'll
* work on newer ones as well. Also, linking a fragment program can
* cost valuable CPU cycles, which is another reason to avoid these
* checks at startup.
*/
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsBIOpShaderSupportAvailable: BufferedImageOp shader supported");
return JNI_TRUE;
}
/**
* Returns JNI_TRUE only if all of the following conditions are met:
* - the GL_ARB_fragment_shader extension is available
* - the LCD text shader codepath has been enabled via the system property
* - the hardware supports the minimum number of texture units
*/
static jboolean
OGLContext_IsLCDShaderSupportAvailable(JNIEnv *env,
jboolean fragShaderAvailable)
{
jboolean isLCDShaderEnabled = JNI_FALSE;
GLint maxTexUnits;
J2dTraceLn(J2D_TRACE_INFO, "OGLContext_IsLCDShaderSupportAvailable");
// first see if the fragment shader extension is available
if (!fragShaderAvailable) {
return JNI_FALSE;
}
// next see if the lcdshader system property has been enabled
isLCDShaderEnabled =
JNU_GetStaticFieldByName(env, NULL,
"sun/java2d/opengl/OGLSurfaceData",
"isLCDShaderEnabled", "Z").z;
if (!isLCDShaderEnabled) {
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsLCDShaderSupportAvailable: disabled via flag");
return JNI_FALSE;
}
// finally, check to see if the hardware supports the required number
// of texture units
j2d_glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS_ARB, &maxTexUnits);
if (maxTexUnits < 2) {
J2dRlsTraceLn1(J2D_TRACE_INFO,
"OGLContext_IsLCDShaderSupportAvailable: not enough tex units (%d)",
maxTexUnits);
}
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsLCDShaderSupportAvailable: LCD text shader supported");
return JNI_TRUE;
}
/**
* Returns JNI_TRUE only if all of the following conditions are met:
* - the GL_EXT_framebuffer_object extension is available
* - FBO support has been enabled via the system property
* - we can successfully create an FBO with depth capabilities
*/
static jboolean
OGLContext_IsFBObjectExtensionAvailable(JNIEnv *env,
const char *extString)
{
jboolean isFBObjectEnabled = JNI_FALSE;
GLuint fbobjectID, textureID, depthID;
jint width = 1, height = 1;
J2dTraceLn(J2D_TRACE_INFO, "OGLContext_IsFBObjectExtensionAvailable");
// first see if the fbobject extension is available
if (!OGLContext_IsExtensionAvailable(extString,
"GL_EXT_framebuffer_object"))
{
return JNI_FALSE;
}
// next see if the depth texture extension is available
if (!OGLContext_IsExtensionAvailable(extString,
"GL_ARB_depth_texture"))
{
return JNI_FALSE;
}
// next see if the fbobject system property has been enabled
isFBObjectEnabled =
JNU_GetStaticFieldByName(env, NULL,
"sun/java2d/opengl/OGLSurfaceData",
"isFBObjectEnabled", "Z").z;
if (!isFBObjectEnabled) {
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsFBObjectExtensionAvailable: disabled via flag");
return JNI_FALSE;
}
// finally, create a dummy fbobject with depth capabilities to see
// if this configuration is supported by the drivers/hardware
// (first we initialize a color texture object that will be used to
// construct the dummy fbobject)
j2d_glGenTextures(1, &textureID);
j2d_glBindTexture(GL_TEXTURE_2D, textureID);
j2d_glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
width, height, 0,
GL_RGB, GL_UNSIGNED_BYTE, NULL);
j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
// initialize framebuffer object using color texture created above
if (!OGLSD_InitFBObject(&fbobjectID, &depthID,
textureID, GL_TEXTURE_2D,
width, height))
{
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsFBObjectExtensionAvailable: fbobject unsupported");
j2d_glDeleteTextures(1, &textureID);
return JNI_FALSE;
}
// delete the temporary resources
j2d_glDeleteTextures(1, &textureID);
j2d_glDeleteRenderbuffersEXT(1, &depthID);
j2d_glDeleteFramebuffersEXT(1, &fbobjectID);
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsFBObjectExtensionAvailable: fbobject supported");
return JNI_TRUE;
}
